Malicious PDF — malware analysis report

Static analysis result for SHA-256 def8921c6c6c713f…

MALICIOUS

PDF

80.4 KB Created: 2021-04-03 10:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b17a11a0e7bb843aedc820e25c645ed8 SHA-1: 208b73c8e2cd0fd5c97f22476c0121eb8db46775 SHA-256: def8921c6c6c713f4113534676938adc59d36772e151ad6ad7bdeadff2a178f2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The primary malicious URL identified is 'https://dugedepap.ru/strik?utm_term=how+much+is+my+nintendo+ds+lite+worth', which is presented as a lure related to item valuation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/strik?utm_term=how+much+is+my+nintendo+ds+lite+worth PDF link annotation
    • https://kivobuduzuv.weebly.com/uploads/1/3/0/7/130739084/5785798.pdfIn PDF document text
    • http://midimox.getenjoyment.net/panofejosur.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/zozidosas.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/bezimuvekitovetalikusopo.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/a01c9ae3733f92d.pdfIn PDF document text
    • https://lazabegikazake.weebly.com/uploads/1/3/5/3/135315211/tunaloxaz-migigolujexeju-jajis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fogibi/platformer_games_steam.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/xotesulilatijowunato.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/bhilai_power_house_weather_report.pdfIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_4f2cc64a6851422e8d06604b9c7eaac8.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_8f28bb50da214730a6df0793adc467ba.pdf?index=trueIn PDF document text
    • http://dogiwexor.myartsonline.com/zoneret.pdfIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_9c57f02ee0294adeb3a7c4ba62ef4312.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_fa71788c96bb43f4bbf42fdd6ea6c850.pdf?index=trueIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_670d2e47b7b14ebd950c5ae619e950fa.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_6819d9f74ffd4141a8552562dbe0a38e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gawabog/58597780292.pdfIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_bf8c5312a7f24659b21632bd22c990ec.pdf?index=trueIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_90f55798bf43433884c17df3723470fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bivanud/on_the_road_lyrics_syd.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 5124 bytes
SHA-256: 0475340a56e5b94243dfe83c534c147c0b3a6c3dfff723868b2152cc0d64dbd5
font_01_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 11568 bytes
SHA-256: d1db80ae780ee95f0ba07a116dae4b3426c0a39eecdbdc7493b2441d06c807e4